Familiars are greatly reduced in power. They have had removed their damage reduction, their regeneration, and spell like abilities. They have penalties to skills they were given for the OC, like Disable Device and Open Lock. They are not tanks, or mages, or rogues. They are companions and friends. PHB-like bonuses have now been added. (You must find out what these special 'perks' are in game for yourselves though.)